Anonymoustype problemer

Kode 

public static object GetUserInfo(Guid ID) {

        LINQDataContext db = new LINQDataContext();

        var result = (from u in db.aspnet_Users
                     join m in db.aspnet_Memberships on u.UserId equals m.UserId
                     join r in db.aspnet_UsersInRoles on u.UserId equals r.UserId
                     join R in db.aspnet_Roles on r.RoleId equals R.RoleId
                     where u.UserId == ID
                     select new
                     {
                         ID = u.UserId,
                         UserName = u.UserName,
                         Email = m.Email,
                         RoleName = R.RoleName

                     }).Single();

        return result;
    }